@aaronpk I've only done this manually, by reviewing the Wikipedia article for the target airport and getting the list of airlines offering service (and the airports they offer service from), then using kayak to find nonstops.
I've heard that https://matrix.itasoftware.com/search is very flexible and it seems like it might have what you want, but I haven't used it. Apparently there's two versions of it currently, also https://oldmatrix.itasoftware.com/ ?
You could try posting on flyertalk if fedi doesn't have an answer :)
@aaronpk Assuming that the connections are symmetric (which I'm pretty sure has to be true, right?), FlightsFrom gives you what you want and only has a couple banner ads for me: https://www.flightsfrom.com/ORF/destinations
@aaronpk oh wait, you said non-stop. That is a different matter.
@aaronpk the airport's site itself usually. flightradar24 has them too.
@aaronpk cannot seem to get it to work. Other option is the airports inbound flight tracker or a flight tracker app and watch them roll in lol
@aaronpk cannot believe I am going to say it. Google
@aaronpk I typically do it by visiting the specific airport website. It usually has a list of airlines flying nonstop into the airport. Usually more useful for smaller airports.